Penn Plax Pro Balance 7-Day Betta Blocks Fish Food Ensure your precious Betta are well fed while you are away traveling or on vacation with the Pro Balance 7-Day Betta Blocks Fish Food. Each of the six fish-shaped blocks provides between one and three fish with up to seven days of nutrition, releasing nutritious freeze-dried food while also neutralizing your aquarium water. To get the best results and most efficient release of particles from the Betta Blocks, keep a minimum temperature of 72 F and PH level of 6.6 to 7.0...